Selection of Current Transformers
Transformer operated energy meters need instrument transformers to reduce high voltage- and current values to lower quantities for measurement purpose.
Cross-sections for electricity wiring
Each conductor wire has a resistance. Resistance means heat development inside the wire. Technically it’s a loss.
The Critical Change Value
The critical change value indicates the maximum amount of change allowed in the meter’s energy registers during disturbance tests without any current flowing in the meter’s current circuits.
No Load Test for Energy Meters 2020
With publishing of the Edition 2 of IEC62052-11 the minimum run time calculation formula has changed.
The Energy Meter Register Resolution
The main purpose of an electronic energy meter is the accurate metering of the customer consumption. The meter has registers for storing the various consumption values
How does a scanning head work?
Each energy meter used for billing must have a test output. An optical indication is mandatory. Beside this the meter can also have electrical test outputs.
The Three-phase Generator Principle
We have a nice three phase power supply in our home, but where does it come from? And why does the waveform has a sine shape?
The four-quadrant diagram in electricity metering
The interactive diagram below shows the relationship between the phase angle φ, apparent-, active- and reactive power respective energy in accordance with clauses 12 and 14 of IEC 60375.